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https://github.com/davidmarble/pywin

Lightweight python 2.5-3.3 launcher and switcher for Windows command line and MSYS/MINGW32
https://github.com/davidmarble/pywin

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Lightweight python 2.5-3.3 launcher and switcher for Windows command line and MSYS/MINGW32

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README 

        
pywin

=====



**pywin** is a lightweight python 2.5-3.3 launcher and switcher for

Windows command line and MSYS/MINGW32. It's similar to the `py.exe

launcher/switcher available in python

3.3 `__, but

written with basic Windows batch scripts and a shell script for

MSYS/MINGW32 support. I use bash and command line shell tools from

`msysgit `__, based on MSYS/MINGW32, to do

most of my python development on Windows.



**pywin** supports several useful features defined in `PEP

397 `__, such as command line

conventions and hash bang #! python version headers in source files.

While pywin lacks some of py.exe's features, it has the basics and a few

extras of its own.



Requirements

------------



-  Windows >= XP for command prompt support

-  Windows >= Vista for MSYS/MINGW support (requires ``mklink`` for

   symbolic links)

-  At least one installation of python 2.5 up to 3.3 (though it's not

   useful without at least two)

-  easy\_install, pip, or git



Installation

------------



-  Make sure the main python installation you want pywin to live under

   is in the PATH.

-  With multiple python installations, it's recommended to have only the

   main and Scripts directories from one installation in your PATH. For

   example, ``C:\Python27;C:\Python27\Scripts``.



easy\_install

~~~~~~~~~~~~~



.. code:: sh



    easy_install pywin



pip

~~~



.. code:: sh



    pip install pywin



from source

~~~~~~~~~~~



.. code:: sh



    git clone git://github.com/davidmarble/pywin.git

    cd pywin

    python setup.py install



Getting Started

---------------



.. code:: sh



    # Assuming pywin was installed with Python27



    C:\>pyassoc



        HKEY_CURRENT_USER\Software\Classes python keys created successfully.



        .py files will launch with "C:\Python27\pywin.bat"



    C:\>pywin genlaunchers



        Generating launchers...



        C:\Python27\python2.7.bat -> C:\Python27\python.exe

        C:\Python27\python2.6.bat -> C:\Python26\python.exe

        C:\Python27\python2.5.bat -> C:\Python25\python.exe

        C:\Python27\python3.0.bat -> C:\Python30\python.exe

        C:\Python27\python3.1.bat -> C:\Python31\python.exe

        C:\Python27\python3.2.bat -> C:\Python32\python.exe

        C:\Python27\python3.3.bat -> C:\Python33\python.exe



    C:\>pywin               # launch first python found in PATH



    C:\>pywin -2.7          # launch python 2.7



    C:\>pywin setdefault 3.3



        Setting default python for active session to: 3.3

        C:\Python33;C:\Python33\Scripts -- now at front of PATH



    # Create a test file with a specified python version in the header

    C:\>echo #! /usr/bin/python2.7 > test.py

    C:\>echo import sys;print("\n  %s"%sys.exec_prefix) >> test.py

    C:\>test.py

      

      C:\Python27



    C:\>pywin -3.2 test.py  # launch test.py with python 3.2



      C:\Python32



Overview

--------



**pywin** and its associated scripts are installed in the main directory

of the active python version (e.g. C:27). There's no need to install it

under more than one version of python (if you do, you'll have to run

``pywin genlaunchers`` for each version you install it under). Make sure

that this main python directory is always on the path. Alternatively you

can move the included scripts to another directory in your path.



Auto-generate version-specific launchers

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



**pywin** can create individual launch scripts to directly access core

python installations (e.g. python2.7). These can be called directly with

or without arguments from the Windows command prompt and MSYS/MINGW bash

prompt. To use this feature, call



.. code:: sh



    pywin genlaunchers



Launchers are created for all machine-wide and user-specific python

installations found in the Windows registry. Windows batch files will be

added to the directory where **pywin** is located. MSYS/MINGW32 relies

on Windows links created programmatically with ``mklink``, which is why

you must have Windows >= Vista installed to make use of this project.



Launch a specific python version using pywin

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



.. code:: sh



    pywin -2.7  # launch python 2.7

    pywin -3.2 test.py  # launch test.py with python 3.2



Automatically invoke the right python with a script header

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



Add a directive to the first or second line of a source file to have the

correct interpreter called. Currently this only supports python

launchers created by the ``pywin genlaunchers`` command. To use this

feature, you must associate the .py extension with pywin.bat using the

included ``pyassoc`` utility.



.. code:: sh



    pyassoc



pywin

-----



**NOTE:** ``pywin`` commands work from both Windows command line and

MSYS/MINGW32 shell.



genlaunchers

~~~~~~~~~~~~



.. code:: sh



    pywin genlaunchers



Search for python installations and create batch files in the same

directory where pywin is installed.



Note if you're using MSYS/MINGW32 this must be run again in the

MSYS/MINGW32 shell, and you must have Windows >= Vista.



setdefault

~~~~~~~~~~



.. code:: sh



    pywin setdefault 



Set the default python to ``.`` version. Adds the right

python home directory and its associated Scripts directory to the front

of PATH. Removes any other existing reference to a python Scripts

directory in PATH.



Example



.. code:: sh



    # Existing PATH: C:\Windows\System32;C:\Windows;C:\Python27;C:\Python27\Scripts



    pywin setdefault 3.3



    # New PATH: C:\Python33;C:\Python33\Scripts;C:\Windows\System32;C:\Windows;C:\Python27;

    # C:\Python27 is preserved so that pywin can be found.



``pywin setdefault`` is only active for the current cmd.exe (or

MSYS/MINGW32 shell) session. If you want to change the

default python permanently, you need to change your system or user

PATH and make sure pywin is installed for that python version.



When calling this from MSYS/MINGW32, enter a dot first so the changes to

$PATH propagate to your active shell. E.g. ``. pywin setdefault 3.3``



launch with version and/or source

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



.. code:: sh



    pywin [-] []



Launch either a specific ``.`` version of python, or a

source file, or both. Note that specifying a version of python on the

command line will override any version in the header of the source file.



Example



.. code:: sh



    # launch python 2.7

    pywin -2.7



    # launch test.py with python 3.2

    pywin -3.2 test.py



    # launch test.py according to Version Search Order below

    pywin test.py



Version Search Order

~~~~~~~~~~~~~~~~~~~~



**pywin** will launch the first version of python found among:



1. Any version specified after a #! in the first 2 lines of the source.

   The interpreter will be invoked with any additional parameters.



   examples:



   ::



       #! python3.3

       #! /usr/bin/python2.7 -v



2. If the environment variable ``VIRTUAL_ENV`` is set, use that

   virtualenv's ``python.exe``.

3. If the environment variable ``PYTHONHOME`` is set, use its

   ``python.exe``.

4. If none of the above, fall back to the first ``python.exe`` found on

   the path.



pyassoc

-------



.. code:: sh



    pyassoc [original] [all_users]



With no arguments, ``pyassoc`` will register the .py extension to run

with ``%pyhome%\pywin.bat``. This change is made in the registry to

``HKEY_CURRENT_USER``, so that when .py files are invoked, any

machine-wide setting is overridden.



Note that registry settings have no effect on launch .py files under

MSYS/MINGW32.



Parameters

~~~~~~~~~~



-  **original** - restore .py registry settings to launch with

   ``%pyhome%\python.exe``

-  **all\_users** - if administrator, apply changes to

   ``HKEY_LOCAL_MACHINE`` and remove any ``HKEY_CURRENT_USER`` python

   keys. Note that users can override this with their own

   ``HKEY_CURRENT_USER`` values.



%pyhome%

~~~~~~~~



The variable ``%pyhome%`` used by ``pyassoc`` is set in this manner:



1. If the environment variable ``PYTHONHOME`` is set, use it.

2. If the environment variable ``DEFAULTPYTHON`` is set, use it. This is

   set when you call ``pywin setdefault ``, but only lasts for

   the current session.

3. The path the ``pyassoc.bat`` script is in.